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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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DP83849IF датащи(PDF) 49 Page - National Semiconductor (TI) |
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DP83849IF датащи(HTML) 49 Page - National Semiconductor (TI) |
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49 / 108 page  49 www.national.com 6.0 Reset Operation The DP83849IF includes an internal power-on reset (POR) function and does not need to be explicitly reset for normal operation after power up. If required during normal opera- tion, the device can be reset by a hardware or software reset. 6.1 Hardware Reset A hardware reset is accomplished by applying a low pulse (TTL level), with a duration of at least 1 µs, to the RESET_N pin. This will reset the device such that all regis- ters will be reinitialized to default values and the hardware configuration values will be re-latched into the device (simi- lar to the power-up/reset operation). 6.2 Full Software Reset A full-chip software reset is accomplished by setting the reset bit (bit 15) of the Basic Mode Control Register (BMCR). The period from the point in time when the reset bit is set to the point in time when software reset has con- cluded is approximately 1 µs. The software reset will reset the device such that all regis- ters will be reset to default values and the hardware config- uration values will be maintained. Software driver code must wait 3 µs following a software reset before allowing further serial MII operations with the DP83849IF. 6.3 Soft Reset A partial software reset can be initiated by setting the Soft Reset bit (bit 9) in the PHYCR2 Register. Setting this bit will reset all transmit and receive operations, but will not reset the register space. All register configurations will be pre- served. Register space will remain available following a Soft Reset. |
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